List and define the three states of matter. S-94

SPS5 Students will compare and contrast the phases of matter as they relate to atomic and molecular motion. a.Compare and contrast the atomic/molecular motion of solids, liquids, gases, and plasmas. b.Relate temperature, pressure, and volume of gases to the behavior of gases. SPS7 Students will relate transformations and flow of energy within a system. d. Explain the flow of energy in phase changes through the use of a phase diagram. Chapter 3 States of Matter

How can shape and volume be used to classify materials? How can kinetic theory and forces of attraction be used to explain the behavior of gases, liquids, and solids? 3.1 Solids, Liquids, and Gases

States of matter and determined by shapes and volumes Solid – definite or fixed volume, and definite shape –Definite – no change if the container is changed Liquid – definite volume, variable shape Gas – variable volume, variable shape 3.1 Solids, Liquids, and Gases How can shape and volume be used to classify materials?

Plasma – occur at very high temperatures –In excess of 200,000 K –Clouds of charged particles Boise-Einstein condensate (BEC) – at very low temperatures –Near 0 K –Groups of atoms act as though they are a single particle 3.1 Solids, Liquids, and Gases How can shape and volume be used to classify materials?

Kinetic Theory – all particles of matter are in constant motion –Kinetic – to move –Stops at 0 Kelvin, absolute zero (-273 o C) –Motion is determined By temperature – higher temperature, faster –Temperature is a measurement of average kinetic energy By forces between particles – higher forces, more attraction between the particles 3.1 Solids, Liquids, and Gases How can kinetic theory and forces of attraction be use to explain the behavior of gases, liquids, and solids?

Gases –Particles are in constant random motion At room temperature the average speed of air particles is 1600 km/hr –The motion of one particle is unaffected by the motion of other particles except when the collide Forces are not strong enough for the speed of the particles –Forces of attraction are low enough to be ignored 3.1 Solids, Liquids, and Gases How can kinetic theory and forces of attraction be use to explain the behavior of gases, liquids, and solids?

Liquids –Particles are in constant random motion –The motion of one particle is affected by the motion of other particles Because the particles are closer together –Forces are strong enough to keep the particles close, but not enough to prevent them from shifting So liquids flow, but do not fill a container 3.1 Solids, Liquids, and Gases How can kinetic theory and forces of attraction be use to explain the behavior of gases, liquids, and solids?

Solids –Particles vibrate in place –Forces are strong enough to keep the particles in place So solids do not flow, and they do not expand to fill the container 3.1 Solids, Liquids, and Gases How can kinetic theory and forces of attraction be use to explain the behavior of gases, liquids, and solids?

Use the kinetic theory to explain the difference between solids, liquids, and gases. S-98 How can kinetic theory and forces of attraction be use to explain the behavior of gases, liquids, and solids?

What causes gas pressure in a closed container? What factors affect gas pressure? How are the temperature, volume, and pressure of a gas related? 3.2 The Gas Laws

Pressure – force applied to an area –Measured in pascals (Pa) One pascal is a newton of force applied over a meter squared area (N/m 2 ) Very small so usually given in kilopascals (kPa) –Gas pressure comes from the collision of gas particles against the sides of the container Pressure increases with the number of collisions and the speed of the collisions 3.2 The Gas Laws What causes gas pressure in a closed container? pHET Physics Applet

Temperature (T) –An increase in temperature increases the average speed of the particles Hot days tire pressure increases Cold days balls are a flat Volume (V) –With a larger area the particles must travel farther before running into a container Squeezing a bottle decreases the volume, enough squeezing and the top will pop off 3.2 The Gas Laws What factors affect gas pressure? pHET Physics Applet

Number of Particles (n) –Pressure increases with the number of particles A gas cylinder is designed to hold a certain amount of gas Walls must be very thick to withstand high pressure 3.2 The Gas Laws What factors affect gas pressure? pHET Physics Applet

Charles’s Law –Volume of a gas is directly proportional to the temperature Pressure must not change Number of particles must not change Temperature is in Kelvin –Add 273 to Celsius temperature 3.2 The Gas Laws How are the temperature, volume, and pressure of a gas related?

Practice Problem – A gas starts with a temperature of 415 K and is cooled to 300 K. If the original volume was 25 mL, what is the new volume? –Equation? –Fill in variables –Solve 3.2 The Gas Laws How are the temperature, volume, and pressure of a gas related?

Boyles Law –The volume of a gas is inversely proportional to the pressure If pressure goes up, volume goes down Number of particles must not change If temperature stays constant 3.2 The Gas Laws How are the temperature, volume, and pressure of a gas related?

Practice Problem – A cylinder has 118 L of gas in at a pressure of 792 kPa. What is the pressure if the volume is reduced to 41 L? –Equation? –Fill in variables –Solve 3.2 The Gas Laws How are the temperature, volume, and pressure of a gas related?

A piston is compressed from 18 L to 7 L. The initial pressure was 218 kPa. What is the new pressure? S-100 How are the temperature, volume, and pressure of a gas related?

Combined Gas Law –Boyle’s and Charles’s law can be combined into a single equation 3.2 The Gas Laws How are the temperature, volume, and pressure of a gas related?

Practice Problem – A cylinder that contains air at 100 kPa has a volume of 0.75 L and a temperature of 298 K. If the pressure is increased to 300 kPa and the temperature drops to 119 K, what is the new volume? –Equation? –Fill in variables –Solve 3.2 The Gas Laws How are the temperature, volume, and pressure of a gas related?

What are six common phase changes? What happens to a substance’s temperature and a system’s energy during a phase change? How are evaporation and boiling different? 3.3 Phase Changes

Phase Change – when a substance goes from one state of matter to another –Melting – solid to liquid –Freezing – liquid to solid –Vaporization – liquid to gas –Condensation – gas to liquid –Sublimation – solid to gas –Deposition – gas to solid 3.3 Phase Changes What are six common phase changes?

List and explain the six phases of matter. S-101 What are six common phase changes?

Temperature – does not change during a phase change –Water melts at 0 o c (273 K) –Water boils at 100 o C (373 K) –The heat energy is being used to break forces between the particles 3.3 Phase Changes What happens to a substance’s temperature and a systems energy during a phase change? Melting Freezing Vaporizing Condensing Phase Change Gizmo

Energy is absorbed or released in a phase change –Endothermic – the system absorbs energy It takes 334 J of energy to melt one gram of water Called the Heat of fusion –Exothermic – the system loses energy Produces heat (glycerin and potassium permanganate) 3.3 Phase Changes What happens to a substance’s temperature and a systems energy during a phase change?

Both evaporation and boiling are vaporization. –Evaporation – changing from a liquid to a gas below the boiling point Slow Faster molecules escape from the surface –Boiling – above the boiling point Phase change occurs other places beside the surface So bubble of gas form 3.3 Phase Changes How are evaporation and boiling different?